A kinetic model for the reactions between the low-fluoride slag CaF 2 –CaO–Al 2 O 3 –MgO–Li 2 O–TiO 2 and Incoloy 825 alloy was proposed based on the two-film theory. The applicability of the model was verified to predict the variation of components in the slag–metal reaction process. The results show that the controlling step of the reaction 4[Al] + 3(TiO 2 ) = 3[Ti] + 2(Al 2 O 3 ) is the mass transfer of Al and Ti in the liquid alloy and the controlling step of the reactions 4[Al] + 3(SiO 2 ) = 3[Si] + 2(Al 2 O 3 ) and [Si] + (TiO 2 ) = [Ti] + (SiO 2 ) is the mass transfer of SiO 2 in the molten slag. With increasing TiO 2 content in the slag from 3.57% to 11.27%, the Al content in the alloy decreased whereas the Ti content increased gradually. The Si content continued to decrease during the slag–metal reaction. Soluble oxygen in the alloy reacts with Al, Ti, and Si, resulting in a decrease of the oxygen content in the alloy. The variations of TiO 2 content were in good agreement with the calculated results by the kinetic model whereas the measured results of Al 2 O 3 and SiO 2 in the slag were lower than the calculated results, which is mainly due to the volatilization of fluoride.

中文翻译：

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Incoloy 825合金与低氟渣电渣重熔反应动力学研究

基于双膜理论，提出了低氟渣CaF 2 -CaO-Al 2 O 3 -MgO-Li 2 O-TiO 2 与Incoloy 825合金反应的动力学模型。验证了该模型的适用性，可用于预测渣-金属反应过程中组分的变化。结果表明，反应4[Al] + 3(TiO 2 ) = 3[Ti] + 2(Al 2 O 3 )的控制步骤是液态合金中Al和Ti的传质，控制步骤为反应 4[Al] + 3(SiO 2 ) = 3[Si] + 2(Al 2 O 3 ) 和 [Si] + (TiO 2 ) = [Ti] + (SiO 2 ) 是 SiO 2 的传质在熔渣中。随着渣中TiO 2 含量从3.57%增加到11.27%，合金中Al含量逐渐降低，而Ti含量逐渐升高。在渣-金属反应过程中，Si 含量持续下降。合金中的可溶氧与Al、Ti和Si发生反应，导致合金中的氧含量降低。TiO 2 含量变化与动力学模型计算结果吻合较好，而渣中Al 2 O 3 和SiO 2 的测定结果低于计算结果，这主要是由于氟化物的挥发。